trapfuzzer is a tool I developed in Python and C and has the following features:
The fuzz scheduling module and data mutation module implemented in Python and the Instrumention module based on breakpoint mechanism based on GDB plugin OR GDB source code, and on Windows via winappdbg OR custom debuggers with Windows debuger SDK. In a specific mode, each breakpoint is triggered once in the whole fuzzing process, so the average test speed is higher than dynamorio, pin and etc. The tool supports i386/x64 architecture, but a small amount of modification can support other architectures such as ARM.
More than 200 vulnerabilities have been found in WPS OFFICE and other software using this tool.